Compaq 1024 Installation Manual page 12

The function of each control may be described as follows:
1. Vertical linearity
If a cross-hatch pattern is displayed on the screen, equal spacing
between the horizontal bars at the top and bottom of the screen
indicates good linearity. However, if the horizontal bars appear to
be crowded at the top of the bottom, the vertical linearity controls
can be used to correct the problem.
2. Vertical S-correction
For a cross-hatch pattern displayed on the screen, if the horizontal
bars appear to be crowded near the center but are of equal spacing
at the top and bottom, the vertical S-correction controls can be
used to correct the problem.
3. Vertical/horizontal compensation
Together with the Horizontal compensation controls, these controls
minimizes the "breathing" effect when the Brightness control is
turned up or down with the Contrast control set at maximum.
4. East-west corner / east-west parabola
Together with the East-west parabola controls, these controls can
be used to correct pincushion and barrel distortions.
5. Trapezium correction
Minimize the trapezium distortion of the display screen.
6. Horizontal frequency hold
For input Horizontal-frequencies that are different from the preset
timings, these controls may be used to synchronize the monitor with
the input signal.
DIP Switch Defaults
The monitor always powers on with the front panel controls controlling
the user functions regardless of the actual DIP switch settings. If the
monitor is powered on with the DIP switch setting other than the
default, reset the DIP switches to their default settings (Off) first before
setting them again to change the front panel control functions.
Appendix A-3